【作者】 张翼；

【导师】 朱瀛波；

【作者基本信息】 武汉理工大学 ， 矿物加工工程， 2006， 硕士

【摘要】 随着陶瓷工业逐步向机械化与自动化生产方向的发展，石膏模具强度低、使用寿命短、质量差的致命弱点越来越突出。可以说模型石膏的强度是决定其使用的最重要的因素，在增强模型石膏性能的研究领域，通过添加减水剂、缓凝剂以及转晶剂可以改变石膏晶体的生长形态，从而增加模型石膏的性能，但是通过改变模型石膏本身的粒度组成以及添加其他材料来改变模型石膏性能的研究还比较少，因此，针对这一问题，本文着重通过改变粒度并对不同粒度组成的模型石膏相关性能进行测试，找出使模型石膏性能最佳的粒级并指导工业生产；另外，通过添加其他非金属矿物材料如云母和水镁石纤维来研究这些非金属矿物材料对模型石膏性能的影响以及它们在模型石膏中的最佳填充量并指导工业生产。 通过上述一系列实验得出了以下实验结果： 1．粒度范围在+0.12mm到-0.061mm时，标准石膏模型的抗折强度随粒度的减小而增加，粒度为-0.061mm的石膏粉抗折性能最好，因此，在工业生产时可以选择加强模型石膏的粉磨力度以增强其性能；两种矿样粒度变化与强度变化之间的数学关系分别为： y=6.371×10^-4x^1.65和y=0.179x^0.592 2．云母粉不适合作为模型石膏的增强材料，云母粉降低模型石膏的吸水率和干湿态抗折强度，当云母含量为5％时，其干湿态抗折强度分别下降18.75％和28.20％。 3．在水膏比为0.63，水镁石纤维含量增加到1％时，石膏标准模型的湿态抗折强度达到最大值3.3Mpa，比未添加水镁石纤维时的强度增加71.88％，最大干态强度值为6.43Mpa，比未添加水镁石纤维的干态抗折强度增加52.43％。 4．根据正交实验结果，在保证石膏浆流动性的情况下水镁石纤维含量在3.6％，水膏比在0.65时标准石膏模型湿态抗折强度最大，达到2.96Mpa，比未添加水镁石纤维时的湿态抗折强度增加了54.17％，水镁石纤维含量在4.2％，水膏比为0.65时的干态抗折强度最大值达到6.92Mpa。更多还原

【Abstract】 With the development of the ceramic industry to mechanization and automation, deadliness chink of is become more extrude which include low intensity short life and bad quality .The chief reasons are that unsteadiness quality ,more changing reasons of the plaster mould . we can say that intensity is the most important reasons which confine using of plaster mould . Contrapose this problem we put the emphases on the way that use physics measure include change the consistant of granularity and join some nonmetal mineral material （include mica fiber brucite ） and to intense plaster mould and check the plaster’s performance and acquire hereinafter production:1. Plaster mould’s most break intension is debasing with debasing of the when the granularity is between +0.12mm to -0.061mm,and the most intension in appear on -240mesh , connection of two types mineral between granularity and intension is that:y=6.371×10^-4x^1.65 and y=0.179x^0.5922. Mica isn’t suit to boost up the mould plaster because it will decrease the intensity and sop quotiety, Plaster mould’s break intension decline 18.75% and 28.20% when content of mica reach 5%.3. Plaster mould’s most wetness break intension is 3.30 Mpa when content of fiber brucite is 1% , ratio of water/plaster is 0.63 which is increase 71.88% to no fiber brucite plaster mould’s.The most dry break intension is 6.43 Mpa which is increase 52.43% to no fiber brucite plaster mould’s.4.According the analyse of orthogonal experiment content of fiber brucite and ratio of water/plaster will affect plaster mould’s most wetness break intension markedness and content of fiber brucite is mostly complication while ratio of water/plaster is subordination complication ;In the precondition of better fluidity , plaster mould’s most wetness break intension is on that content of fiber brucite is 3.6% ratio of water/plaster is 0.65,it become 2.96 Mpa which is increase 54.17% to no fiber brucite plaster mould’s,更多还原